To be directly or very closely involved in, attuned to, or enthusiastic about something. My wife has a lot of friends who are plugged into various performance arts around the city.I've been really plugged into the heavy metal scene ever since college.
plug something into something(and plug something in)
to connect something to something else, usually by connecting wires together with a plug and socket. Plug this end of the wire into the wall.Plug in the lamp and turn it on.
plug into
v.
To insert a part of some object into an outlet, socket, or some other receptacle, especially to make a mechanical or electrical connection: Plug the iron into the electrical outlet. I plugged the speakers into the back of the receiver.